Add blob extension handling to BlobStorageWorkflowsProvider

- Introduce `BlobExtensions` for extracting blob file extensions.
- Add `SupportsExtension` to `IBlobWorkflowFormatHandler` to filter handlers by supported extensions.

Author: sfmskywalker

src/modules/Elsa.WorkflowProviders.BlobStorage/Extensions/BlobExtensions.cs

@@ -0,0 +1,8 @@
+using FluentStorage.Blobs;
+
+namespace Elsa.Extensions;
+
+public static class BlobExtensions
+{
+    public static string GetExtension(this Blob blob) => Path.GetExtension(blob.Name).TrimStart('.');
+}

src/modules/Elsa.WorkflowProviders.BlobStorage/Extensions/BlobWorkflowFormatHandlerExtensions.cs

@@ -0,0 +1,8 @@
+using Elsa.WorkflowProviders.BlobStorage.Contracts;
+
+namespace Elsa.Extensions;
+
+public static class BlobWorkflowFormatHandlerExtensions
+{
+    public static bool SupportsExtension(this IBlobWorkflowFormatHandler handler, string extension) => handler.SupportedExtensions.Contains(extension, StringComparer.OrdinalIgnoreCase);
+}

src/modules/Elsa.WorkflowProviders.BlobStorage/Providers/BlobStorageWorkflowsProvider.cs

@@ -1,4 +1,5 @@
-using Elsa.WorkflowProviders.BlobStorage.Contracts;
+using Elsa.Extensions;
+using Elsa.WorkflowProviders.BlobStorage.Contracts;
 using Elsa.Workflows.Runtime;
 using FluentStorage.Blobs;
 using JetBrains.Annotations;
@@ -71,11 +72,13 @@ public async ValueTask<IEnumerable<MaterializedWorkflow>> GetWorkflowsAsync(Canc
     {
         var blobStorage = _blobStorageProvider.GetBlobStorage();
         var content = await blobStorage.ReadTextAsync(blob.FullPath, cancellationToken: cancellationToken);
-
         var contentType = blob.Properties.TryGetValue("ContentType", out var ct) ? ct?.ToString() : null;
 
         foreach (var handler in _handlers)
         {
+            if (!handler.SupportsExtension(blob.GetExtension()))
+                continue;
+            
             if (!handler.CanHandle(blob, contentType))
                 continue;